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TM5-4120-387-14
TABLE 4-2. TROUBLESHOOTING (Cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 6.
Check air flow out of conditioned air (evaporator) discharge
grille. If air flow volume is low:
a.
Adjust conditioned air (evaporator) intake grille louvers.
b.
Clean and service or replace conditioned air filter element.
(See para 4-25. )
c.
Clean and service or replace mist eliminator. (See para
4-26.)
d.
Clean evaporator coil and entire evaporator section.
(See
para 4-61.)
Step 7.
Check for loose or damaged wires and terminals.
Voltages used can kill.
Always disconnect power cord to
air conditioner before performing any internal
maintenance.
Shutting unit off at its control panel does
not disconnect unit power.
Tighten loose or damaged terminals. Repair or replace damaged
wires.
(See para 4-27.)
Step 8.
Check operation of heater thermostat (S3).
Test thermostat.
(See para 4-56.)
Replace thermostat if
defective.
Step 9.
Check individual heaters (HR1 thru HR6).
Test heaters.
(See para 4-57.) Replace defective heaters.
Step 10.
Check operation of fan toggle switch (S7).
Switch from LO to HI SPEED.
If no change results, test switch.
(See para 4-48.) Replace bad switch.
7.
NO HEAT IN EITHER HI HEAT OR LOW HEAT MODE.
Step 1.
Check for loose or damaged electrical connectors, or damaged wires
in wiring harnesses.
Voltages used can kill.
Always disconnect power cord to
air conditioner before performing any internal
maintenance.
Shutting unit off at its control panel does
not disconnect unit power.
Tighten or replace loose or damaged connectors or repair damaged
wires.
4-47
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